The Sony MDR-AS100W Headphones are sleek and lightweight, boasting a secure and comfortable fit with three different earbud sizes. What's more, a shock absorbing mechanism prevents noise transfer during physical activities and special guards help moisture pass around the headphones. For added convenience, a handy clip secures the cord and there's a hard carrying case for keeping them safe while traveling. Not only do these active style headphones feature 13.3mm Driver units for crystal clear Sound and deep bass, they're also perfect for intense workout activities, with the built-in shock absorbing technology.